Tensioning device for a face mask



FIG. 1 is a perspective view of a tensioning device for a face mask in condition of use, showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The dashed-dot-dash broken lines in FIG. 1 depict environmental subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a tensioning device for a face mask, as shown and described. 